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The statement said it was the first time the woman had left the baby in Toohey's sole care overnight, and that he had a good relationship with the baby.

Toohey claimed that the baby had been sleepless the night before her death, and he had given her Panadol before receiving a call from the woman asking him to collect her from hospital.

"I changed the nappy we went outside and sat (her) on the trampoline. She's a happy baby," he said.

A man who claimed a baby fell from a trampoline has been charged with manslaughter. (9NEWS) ()

He told police that "she fell head first off the trampoline, she cried straight away so I picked her up and rubbed her, and then she stopped crying, and then she was not breathing properly so I put her in the car and flew straight into the hospital".

"It happened like… so quick it wasn't funny," Toohey said.

Forensic pathologist Timothy Lyons told the court that the extent of the baby's brain injuries could not be explained by a short fall from a trampoline.

He said the multiple impact injuries had not been adequately explained and that he was highly suspicious of them.

Dr Lyons also said it was "not the case any one blow had been the cause of death to the exclusion of others".

The Crown argued Toohey lied in recounting the timing of the events that followed, alleging he told deliberate untruths about the sequence and how quickly he drove to hospital after the time he claimed the baby fell.

They alleged there were gaps and inconsistencies in Toohey's accounts and argued that a trampoline fall was not a reasonable possibility, with evidence displacing and showing by a number of inconsistences that the fall did not happen.

Conversely, Toohey's defence team argued that some of the blunt force injury was caused by the fall.

Toohey will be sentenced in September.

The girl's family welcomed the manslaughter verdict.

"I think guilty of something is what we were after, you know she was in his care and she's not here anymore," the baby's second cousin said.

"She was a beautiful little girl you know, we'll always have memories of her and the whole family will have memories of her and she'll always be remembered."